{
    "observer": {
       "observer1": "12345",
       "observer2": "54321"
    },
    "operator": {
        "Vasa": "123456",
        "Ivan": "654321"
    },
    "engineer": {
        "engineer1": "password"
    },
    "engineer_old": {
        "engineer1": [
            "password",
            "hardware_key"
        ]
    }
}
